svelte

clean-limbed, trim

sylphlike, willowy

angular, rawboned, scraggy, scrawny, sinewy, wiry

lank, lanky, rangy, reedy, spindling, spindly, stringy, twiggy, waspish, weedy

anorectic (also anoretic), anorexic, cadaverous, emaciated, gaunt, haggard, pinched, skeletal, wasted, wizened

meager (or meagre), puny, slight

cavalier, glib, slick, unctuous

civilized, couth, cultivated, cultured, genteel, graceful, gracious, poised, polished, refined, well-bred

cosmopolitan, metro, metropolitan, smart, worldly-wise

experienced, knowing, practiced (also practised), schooled, seasoned

amiable, appealing, attractive

assured, calm, collected, composed, confident, cool, placid, secure, self-assured, self-confident, self-possessed, serene, tranquil, undisturbed, unperturbed